<?php
/**
 * Zend Framework
 * LICENSE
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 * @category Zend
 * @package Zend_Filter
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 * @version $Id: Encrypt.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 *
 * @see Zend_Filter_Interface
 */
require_once 'Zend/Filter/Interface.php';
/**
 *
 * @see Zend_Loader
 */
require_once 'Zend/Loader.php';

/**
 * Encrypts a given string
 * @category Zend
 * @package Zend_Filter
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 */
class Zend_Filter_Encrypt implements Zend_Filter_Interface {

    /**
     * Encryption adapter
     */
    protected $_adapter;

    /**
     * Class constructor
     * @param string|array $options (Optional) Options to set, if null mcrypt is used
     */
    public function __construct ($options = null) {
        if ($options instanceof Zend_Config) {
            $options = $options -> toArray ();
        }
        $this -> setAdapter ($options);
    }

    /**
     * Returns the name of the set adapter
     * @return string
     */
    public function getAdapter () {
        return $this -> _adapter -> toString ();
    }

    /**
     * Sets new encryption options
     * @param string|array $options (Optional) Encryption options
     * @return Zend_Filter_Encrypt
     */
    public function setAdapter ($options = null) {
        if (is_string ($options)) {
            $adapter = $options;
        } else 
            if (isset ($options['adapter'])) {
                $adapter = $options['adapter'];
                unset ($options['adapter']);
            } else {
                $adapter = 'Mcrypt';
            }
        if ( ! is_array ($options)) {
            $options = array();
        }
        if (Zend_Loader::isReadable ('Zend/Filter/Encrypt/' . ucfirst ($adapter) . '.php')) {
            $adapter = 'Zend_Filter_Encrypt_' . ucfirst ($adapter);
        }
        if ( ! class_exists ($adapter)) {
            Zend_Loader::loadClass ($adapter);
        }
        $this -> _adapter = new $adapter ($options);
        if ( ! $this -> _adapter instanceof Zend_Filter_Encrypt_Interface) {
            require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception ("Encoding adapter '" . $adapter . "' does not implement Zend_Filter_Encrypt_Interface");
        }
        return $this;
    }

    /**
     * Calls adapter methods
     * @param string $method Method to call
     * @param string|array $options Options for this method
     */
    public function __call ($method, $options) {
        $part = substr ($method, 0, 3);
        if ((($part != 'get') and ($part != 'set')) or  ! method_exists ($this -> _adapter, $method)) {
            require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception ("Unknown method '{$method}'");
        }
        return call_user_func_array (array($this -> _adapter, $method), $options);
    }

    /**
     * Defined by Zend_Filter_Interface
     * Encrypts the content $value with the defined settings
     * @param string $value Content to encrypt
     * @return string The encrypted content
     */
    public function filter ($value) {
        return $this -> _adapter -> encrypt ($value);
    }

}
